Add DataStream to Spanner IT

Signed-off-by: Jeffrey Kinard <jeff@thekinards.com>

it/conditions/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Copyright (C) 2023 Google Inc.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License"); you may not
+  ~ use this file except in compliance with the License. You may obtain a copy of
+  ~ the License at
+  ~
+  ~ http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+  ~ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+  ~ License for the specific language governing permissions and limitations under
+  ~ the License.
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-->
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>com.google.cloud.teleport</groupId>
+        <artifactId>integration-testing-lib</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>it-conditions</artifactId>
+
+    <properties>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.beam</groupId>
+            <artifactId>beam-it-conditions</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.google.auto.value</groupId>
+            <artifactId>auto-value</artifactId>
+            <version>${autovalue.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.auto.value</groupId>
+            <artifactId>auto-value-annotations</artifactId>
+            <version>${autovalue.version}</version>
+        </dependency>
+    </dependencies>
+</project>

it/conditions/src/main/java/org/apache/beam/it/conditions/ChainedConditionCheck.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.it.conditions;
+
+import com.google.auto.value.AutoValue;
+import java.util.List;
+import org.apache.commons.lang3.NotImplementedException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The ChainedConditionCheck class provides a base interface for chaining {@link ConditionCheck}
+ * checks. Each subsequent check will wait on the previous check to complete and return true.
+ */
+@AutoValue
+public abstract class ChainedConditionCheck extends ConditionCheck {
+
+  private static final Logger LOG = LoggerFactory.getLogger(ChainedConditionCheck.class);
+
+  private int functionIndex = 0;
+
+  abstract List<ConditionCheck> conditionChecks();
+
+  @Override
+  public String getDescription() {
+    return String.format(
+        "Chained condition check %d/%d...", functionIndex + 1, conditionChecks().size());
+  }
+
+  @Override
+  public Boolean get() {
+    LOG.info(getDescription());
+    if (conditionChecks().get(functionIndex).get()) {
+      functionIndex++;
+    }
+    return functionIndex == conditionChecks().size();
+  }
+
+  @Override
+  protected CheckResult check() {
+    throw new NotImplementedException("This check() should never be called.");
+  }
+
+  public static Builder builder(List<ConditionCheck> conditionChecks) {
+    return new AutoValue_ChainedConditionCheck.Builder().setConditionChecks(conditionChecks);
+  }
+
+  @AutoValue.Builder
+  public abstract static class Builder {
+
+    public abstract Builder setConditionChecks(List<ConditionCheck> setConditionChecks);
+
+    abstract ChainedConditionCheck autoBuild();
+
+    public ChainedConditionCheck build() {
+      return autoBuild();
+    }
+  }
+}

it/conditions/src/main/java/org/apache/beam/it/conditions/package-info.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** Package for working with test artifacts. */
+package org.apache.beam.it.conditions;